Scan URLs and add larger txtar tests

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 80.39216% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.99%. Comparing base (5f38d06) to head (405b9ec).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/syntax/scanner/scanner.go	70.37%	6 Missing and 2 partials ⚠️
internal/syntax/token/token.go	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   74.14%   75.99%   +1.84%     
==========================================
  Files           6        6              
  Lines         379      429      +50     
==========================================
+ Hits          281      326      +45     
- Misses         94       98       +4     
- Partials        4        5       +1     

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